High-end Crankshaft for Vespa GS 160/SS 180 Models. Highest quality for a perfect restoration and an Engine with maximum reliability and low vibrations.
The Crankshaft, together with the Cylinder, forms the heart of every Engine. It is one of the most heavily stressed parts. The conversion from stroke to rotary motion places the highest demands on quality and workmanship. The Shaft should also be well balanced to reduce vibrations. The oscillating masses should be low to support the performance of the Engine. The lower connecting rod bearing rotates at engine speed, is lubricated by the two-stroke mixture and must absorb the load of the Piston's change of direction twice with each revolution. The Crankpin, which connects the two crank webs and the Conrod, must be compressed to exactly the right degree. If the pressure is too low, the crank webs will twist in relation to each other. To ensure that sufficient mixture reaches the lower connecting rod bearing for lubrication, the lower connecting rod eye should be provided with lubrication slots.
The SIP Crankshaft:
The new Crankshafts Line from SIP is manufactured in Italy and meets all these requirements. Particular attention has been paid to the highest quality and sophisticated design features. The balancing of each Crankshaft is adapted to the stroke, connecting rod length and scooter model.
The shafts are available in two versions. The "Premium" Models are supplied with a high-quality standard Conrod, i.e. with an untreated surface. The Conrod is equipped with cooling slots and holes for the bearings.
The "Performance" Shafts are fitted with an extremely high-quality polished Conrod. Polishing refines the surface. This means that it becomes denser and has a more stable structure, which makes the Conrod more resistant. The polished surface also ensures less turbulence. The polished Conrods are further weight-optimized. Their lateral contour is more aerodynamically shaped and they have been reworked in the area of the lower bearing for even better cooling of the connecting rod bearing.
Shafts for the Vespa GS 160/SS 180 Models:
We also offer Crankshafts of the very highest quality for the Engines of the rare GS 160 / SS 180 Models. The 45141100 is an original spare part for first series GS 160 vehicles with the thin 15 mm Gudgeon Pin and bronze bushing as Sliding Bearing on the Gudgeon Pin.
All GS 160 and SS 180 Model Engines can be converted to "second series" and then benefit from the robust 16 mm Gudgeon Pin (use 2nd series or SS pistons). In addition, a genuine Needle Bearing is used on the Gudgeon Pin, which allows the oil ratio in the gasoline to be reduced to 1:50. We offer this Shaft as 45150500 with Premium Conrod and as 45150100 with polished Performance Conrod.
For those who would like to rely on a modern, electronic and contactless Ignition, our article number 45150600 "Race" Crankshaft is just the thing. On the ignition side, it has the matching Cone for PX-style Ignitions. The stub is also modernized on the clutch side so that all types of PX and Cosa clutches can be fitted. A suitable CNC-milled adapter ring is included for adapting the PX Ignitions. Perfect for frequent riders and in combination with tuning cylinders.
Conclusion: The right Crankshaft for every requirement - from SIP.
SIP TIP:
- The alternator bearings of the GS and SS Engines are sealed on both sides and require regular re-greasing with > high-pressure grease <.
- To ensure that the high-pressure grease stays where it belongs, it is best to use our high-quality Oil Seals 40066100 and 91048100.
- The PX stub on the Crankshaft 45150600 "Race" requires the use of the thick PX Washer 3.8 mm SIP 11351931.
- With the Puller Tool Crankshaft 18119000 you can change the crankshaft and the bearings professionally.
